Dirt introduces the audience to Mötley Crüe members before they meet and created their now famous band. The film sinks into Nikki Sixx’s (Douglas Booth) childhood, watching him until he eventually arrives at the West Hollywood musical scene. There, he meets Tommy Lee (Colson Baker aka Machine Gun Kelly) and they decide to form a band. I meet Mick Mars (Iwan Rheon) and, for their final play, Tommy suggests a former high school colleague, Vince Neil. The band gains notoriety on the local stage, attracting the attention of director Tom Zutaut (Pete Davidson). However, the band suffers dark days in which Vince makes a drunk car accident and Nikki becomes heroin addicted. Finally, it becomes clear that men will strive to survive their lifestyle.